Effect of an acidifying nitrogen fertiliser and lime on soil pH and wheat yields, 1. Soil effects [Western Australia].
1994
Mason M.G. | Porter W.M. | Cox W.J.
In long-term field trials commenced in 1980 at 3 sites in Western Australia, the use of an acidifying fertilizer (17.5 percent N plus 7.6 percent P) reduced soil pH at all sites, and the reduction was greater with higher application rate. Limestone applied at 3 t per ha in 1980 increased soil pH at 0-10 cm depth at all sites, but in all cases pH fell with time, although remaining above that of unlimed treatments for at least 9 years. The results showed that use of such N plus P fertilizers based on ammonium sulphate-phosphate lower the soil pH, increasing the likelihood of yield reductions due to problems such as Al toxicity or Mo, Mg, or K deficiency.
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